Regarding the copyrights question: The ICC profile that I got as the result of the conversion is 536 bytes, at least 29 of which are the ASCII name string that is equal to "Sony ILCE-5100 Adobe Standard". It contains only the following tags: desc, cprt (= "Copyright, the creator of this profile (generated by DCamProf v1.0.5)"), wtpt (1 XYZ tuple), rXYZ, rXYZ, rXYZ, (the most important and probably the only part we actually need — the color matrix), and tone response curves which are just straight lines.
As I see, the only thing in the final ICC profile that could possibly be non-trivial enough to raise copyright questions is the 3x3 color matrix. > On 4 May 2018, at 22:10, Sarge Borsch <sausagefacto...@gmail.com> wrote: > > So, I tried to edit an ICC file in a hex editor to put the values from that > website, and, just as expected, got nonsensical results. > > After that I tried another idea to snatch better color profiles — I searched > the web for Adobe Camera Raw package, extracted the profiles from it (they > are in .dcp format), and figured that it's possible to convert them to ICC by > dcamprof. > They seem to work very well — better than the currently built-in input > profiles for sony a5100 in darktable. > Now what do you think about the copyright status of these converted ICC > profiles? Can they legally be distributed with darktable, or should I keep > them only for myself? > They are a lot smaller than the source .dcc files, probably because they > don't keep nothing valuable except the color matrices. So are 3x3 numeric > matrices copyrightable? > > If you think these profiles can be officially added to darktable, I may fix > the name tags and submit a pull request. > >> On 4 May 2018, at 17:14, Sarge Borsch <sausagefacto...@gmail.com> wrote: >> >> Hi. >> I see that there are measured color responses at >> https://www.dxomark.com/Cameras/Sony/A5100---Measurements >> Hence the question: is it a good idea to try to take the built-in profile >> and replace the primaries with these measured values, in order to get closer >> to the in-camera JPEG color rendering? (or are they already used?) >> >> I'm asking that because I've noticed that none of the built-in input color >> profiles for sony a5100 allows me to get close to the in-camera JPEG colors. >> The 2 of them which are the closest to the correct rendering (that is, >> matching camera JPEG, which is quite good when judging by eye) are the >> "standard color matrix" and "linear Rec2020 RGB". >> Both of them wildly differ from the in-camera JPEG in deep blue colors: >> "standard color matrix" causes them to be clipped and to look really >> unnatural, and "linear Rec2020 RGB" looks more or less natural, but the hue >> is obviously different (blue gets moved to cyan). Hence I started to wonder >> how easy is it to get a better color profile. >> >> I know that ideally this should be done with a color chart, but I don't have >> one and don't have spare money for it at the moment. >> >> Also I can share a shot of the example object (Raw + JPEG) which has such >> problematic color if anyone wants to test it, too. > ___________________________________________________________________________ darktable developer mailing list to unsubscribe send a mail to darktable-dev+unsubscr...@lists.darktable.org
